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#1 2008-09-13 09:35:29

tony123
Member
Registered: 2007-08-03
Posts: 189

N!

For a positive integer,

, we define N! (read N factorial) to
be the product of all the integers from 1 to N. Thus:

It is clear that N! will end in a zero if N is larger or equal to
5. For big values of N, N! will end in many, many zeros.
How many zeros will
end in?

Last edited by tony123 (2008-09-13 09:38:07)

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#2 2008-09-13 10:17:47

mathsyperson
Moderator
Registered: 2005-06-22
Posts: 4,900

Re: N!

75/5 + 75/5² = 18.


Why did the vector cross the road?
It wanted to be normal.

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